During the last months of World War II, Boldt was seconded to Reinhard Gehlen's military intelligence staff. He was stationed in German dictator Adolf Hitler's Führerbunker. This was located below the Reich Chancellery in central Berlin. Boldt reported to General Hans Krebs and was summoned to a daily briefing session with Hitler, his generals, and closest associates - in particular Martin Bormann, Hermann Göring, and Joseph Goebbels. Boldt had a unique opportunity to observe at close quarters the leading members of the Nazi hierarchy during the Battle of Berlin. After the war, he wrote about his experiences during the last days in Nazi-held Berlin. Boldt's description of the atmosphere, first in the semi-ruined Reich Chancellery and then in the claustrophobic surroundings of the Führerbunker, convey a chilling impression of destruction and of the collapse of the entire Nazi system.

By 21 April 1945, Soviet Marshal Georgi Zhukov's1st Belorussian Front had broken through the defenses of German General Gotthard Heinrici's Army Group Vistula on the Seelow Heights. Having achieved the breakthrough, the Soviets were advancing towards Berlin with little to stop them. Adolf Hitler, ignoring the facts, saw salvation in the ragtag units commanded by one of his favorite generals, Felix Steiner. Steiner's command became known as "Army Detachment Steiner" (Armeeabteilung Steiner). Unfortunately for the Germans, Army Detachment Steiner was an army which existed primarily on paper: it was something more than a corps but less than an army. Hitler ordered Steiner to attack the northern flank of the huge salient created by Zhukov's breakthrough; and the German Ninth Army, commanded by General Theodor Busse, which had been pushed to the south of the salient, was ordered to attack northward in a pincer movement.

Late on 21 April, Heinrici called Hans Krebs, chief of the German General Staff (OKH), and told him that Hitler's plan could not be implemented. Heinrici asked to speak to Hitler but was told by Krebs that Hitler was too busy to take his call.

Of 22 April, Boldt wrote the following concerning Hitler's breakdown during one of his last conferences:

"Hitler interrupted the report to ask what had happened to General Felix Steiner's offensive . . . There was a long silence and then Hitler was told that the attack had never been launched, and that the withdrawal from Berlin of several units of Steiner's army, on Hitler's orders, had so weakened the front that the Russians had broken through into Berlin."

"Then Hitler started jumping up and down, while he ranted and raved. His face turned white and purple in turns, and he was shaking all over. His voice kept breaking, as he screamed out the words disloyalty, cowardice, treachery, and insubordination. There followed accusations against the Wehrmacht and the Waffen-SS, of the kind that previous explosions had brought out in somewhat milder form. His outburst culminated in the oath that he would remain in Berlin, with the Berliners, that he would lead the fight personally -- let all who wish to desert him and the city do so now. And then something happened that none of those present had ever seen or expected to see. Hitler suddenly returned to his chair and collapsed. He stammered out: 'It's all up . . . the war is lost . . . I shall shoot myself.' " [1]

Almost immediately after Hitler's plan for Steiner failed to launch, a new plan was created. The new plan involved General Walther Wenck and his Twelfth Army. Wenck's army faced the Americans to the west. The new plan had Wenck attack with his army to the east, link up with the Ninth Army of General Theodor Busse, and relieve Berlin.

Of 25 April to 26 April, Boldt wrote the following about Hitler's order to flood the underground railway:

"When we arrived for the talk, Hitler rose and we followed him into the conference room. Though no encouraging message from General Walther Wenck (Twelfth Army) had been received, Hitler continued to clutch at that straw. Regardless of the fate of the starving, thirsting, and dying population, he was determined to postpone the inevitable end even further. And then he gave one of the most inhuman of all his orders: because the Russians had repeatedly thrown back the German lines by advancing through the underground and other railway tunnels to attack the German forces from the rear, he now detailed special units to open the locks of the river Spree, thus flooding the railway tunnels south of the Reich Chancellery. These tunnels were crammed with civilians and thousands of wounded. They were no longer of interest to him. His insane order cost the lives of very many people." [2]

"At about 2:00 am, I lay down completely exhausted and tried to catch a few hours of sleep. Noise drifted across from the room next door, where Martin Bormann, Hans Krebs, and Wilhelm Burgdorf sat carousing. I must have been asleep for two-and-one-half hours when Bernd (Bernd von Freytag-Loringhoven) in the bunk beneath me woke me up. 'You really are missing something, just listen to that!' he whispered. Burgdorf was shouting at Bormann: 'Believe me, I have done my very best to smooth things over between Hitler and the Army, so much so that the Army has called me a traitor to the German Officers' Corps. Now I realize that they were right all along, that my work was in vain, my idealism misdirected, no, naive and stupid.' Breathing heavily, he paused for a moment. Krebs tried to calm him down and begged him to spare Bormann's feelings."

"But Burgdorf went on regardless: 'Just leave me to it, Hans, it has to be said for once. In forty-eight hours it may well be too late. Our young officers went into battle full of faith and idealism. They went to their death by the hundred-thousand. But for what? For their Fatherland, for Germany's greatness and future? For a decent life? In their hearts they did, but nowhere else. They died for you, for your pockets, for your boundless ambitions. Thinking they were dying for a just cause, our youth allowed themselves to be bled to death on the battlefields of Europe, sacrificing millions of innocent lives, while you, the Party leaders, waxed richer and richer, living it up like lords, accumulating untold riches, stealing vast estates, building castles, reveling in luxury, deceiving and milking the nation. Our ideals, our morals, our faith, our soul -- all these you have ground into dirt; mankind was only a stepping stone for your insatiable greed. You have destroyed our ancient culture, you have broken up our nation. That is your only achievement!' "

"The general's voice had risen to a roar. Now the bunker was quite still. We could hear his breath come in gasps. Then we heard Bormann's cool, superior, and oily voice. All he had to say was this: 'My dear fellow, do you really have to be so personal? Even if the others have filled their pockets, I myself am free of blame. That I swear to you by all I hold dear. Cheers my friend, and drink up!' " [3]

Early on 29 April, Freytag-Loringhoven informed Boldt that Hitler had married Eva Braun. Boldt was laughing at the news when Krebs came from behind a curtain and chastised him: "Have you gone quite mad? How dare you laugh at your highest commander?"

On 29 April, three couriers left Berlin. Each left with a copy of the last will and testament of Adolf Hitler. Communications were down, the Soviets were closing in, and many were morbidly anticipating Hitler's suicide. Boldt's friend, Bernd von Freytag-Loringhoven, obtained permission for them to leave. That evening, Boldt left the Führerbunker with Freytag-Loringhoven and Burgdorf's assistant, Lieutenant-Colonel Rudolf Weiss.[4] Weiss became separated from his two companions and was captured. He endured five years of captivity in a Soviet POW camp in Poland. On 12 May, after several close encounters with Soviet forces, the two other men parted company; Boldt going north to Lubeck and von Loringhoven heading towards Leipzig to join his wife and son.[5]

Despite what has been written above, Boldt may not have been present in the Führerbunker during Hitler's last days. One writer, Robert Payne of Time magazine, once wrote in a 1973 review: ‘Gerhard Boldt, who, as it turns out, constructs Hitler's very last days from already published sources—since he was not there.’ "Time Magazine" Therefore, the quotations above from Boldt's book may be fabrications. On balance, other sources do reference Boldt having been in the Führerbunker "The End in Wannsee"